14 Aug
2003
14 Aug
'03
1:17 p.m.
At Thu, 14 Aug 2003 16:27:37 +0200,
Robert Jonsson wrote:
Hi,
A fairly of topic question: Since 2.6 contains several schedulers; is this
selectable at runtime or is it a compiletime switch ?
it's defined statically in kernel/sched.c:
/*
* These are the 'tuning knobs' of the scheduler:
*
* Minimum timeslice is 10 msecs, default timeslice is 100 msecs,
* maximum timeslice is 200 msecs. Timeslices get refilled after
* they expire.
*/
#define MIN_TIMESLICE ( 10 * HZ / 1000)
#define MAX_TIMESLICE (200 * HZ / 1000)
...
(remember that HZ=1000 in 2.6 for i386.)
I also
found 2.6.0-test[123] to be less responsive than 2.4.x-ll, or even
stock 2.4.x. I've also experienced XMMS dropouts under load (for example
compiling Muse)
Some behaviour I've noticed is that under heavy load the desktop/audio
doesn't freeze for a certain block of time, but rather in short (~2
seconds) intervalls...
this should have been imporved significantly in -mm tree.
even reducing the min/max timeslices would help a lot. the default
values look too large for desktop users... Sounds shaky to select at runtime, but infinitely cool
:)
i guess it would be relatively easy to replace the above with
variables controlled via sysctl.
Takashi